Document references added to iana.txt

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
diff --git a/rfc/iana.txt b/rfc/iana.txt
index 6b65b9c..f32f9ac 100644
--- a/rfc/iana.txt
+++ b/rfc/iana.txt
@@ -1,20 +1,20 @@
-ID        protocol     protocol  endpoint
-                       version   type
---------------------------------------------------
+ID        protocol     protocol  endpoint    defined
+                       version   type        in
+--------------------------------------------------------------------------------
 0-15      <unused>
-16        pair         1         pair
+16        pair         1         pair        <no document yet>
 17-31     <unused>
-32        pubsub       1         pub
-33        pubsub       1         sub
+32        pubsub       1         pub         sp-publish-subscribe-01.txt
+33        pubsub       1         sub         sp-publish-subscribe-01.txt
 34-47     <unused>
-48        reqrep       1         req
-49        reqrep       1         rep
+48        reqrep       1         req         sp-request-reply-01.txt
+49        reqrep       1         rep         sp-request-reply-01.txt
 50-79     <unused>
-80        pipeline     1         push
-81        pipeline     1         pull
+80        pipeline     1         push        <no document yet>
+81        pipeline     1         pull        <no document yet>
 82-95     <unused>
-96        survey       1         surveyor
-97        survey       1         respondent
+96        survey       1         surveyor    <no document yet>
+97        survey       1         respondent  <no document yet>
 98-111    <unused>
-112       bus          1         bus
+112       bus          1         bus         <no document yet>
 113-65535 <unused>